com.espertech.esper.epl.expression.methodagg
Class ExprPlugInAggFunctionFactoryNode

java.lang.Object
  com.espertech.esper.epl.expression.core.ExprNodeBase
      com.espertech.esper.epl.expression.baseagg.ExprAggregateNodeBase
          com.espertech.esper.epl.expression.methodagg.ExprPlugInAggFunctionFactoryNode

All Implemented Interfaces:

ExprAggregateNode, ExprAggregationPlugInNodeMarker, ExprEvaluator, ExprNode, ExprValidator, MetaDefItem, java.io.Serializable

public class ExprPlugInAggFunctionFactoryNode
extends ExprAggregateNodeBase
implements ExprAggregationPlugInNodeMarker

Represents a custom aggregation function in an expresson tree.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.espertech.esper.epl.expression.baseagg.ExprAggregateNodeBase

aggregationResultFuture, column, isDistinct, optionalAggregateLocalGroupByDesc, positionalParams

Constructor Summary

ExprPlugInAggFunctionFactoryNode(boolean distinct, AggregationFunctionFactory aggregationFunctionFactory, java.lang.String functionName)
Ctor.

Method Summary

boolean	equalsNodeAggregateMethodOnly(ExprAggregateNode node) Return true if a expression aggregate node semantically equals the current node, or false if not.
java.lang.String	getAggregationFunctionName() Returns the aggregation function name for representation in a generate expression string.
AggregationMethodFactory	validateAggregationChild(ExprValidationContext validationContext) Gives the aggregation node a chance to validate the sub-expression types.

Methods inherited from class com.espertech.esper.epl.expression.baseagg.ExprAggregateNodeBase

equalsNode, evaluate, getExprEvaluator, getFactory, getOptionalLocalGroupBy, getPositionalParams, getPrecedence, getType, isConstantResult, isDistinct, isExprTextWildcardWhenNoParams, makeExceptionExpectedParamNum, setAggregationResultFuture, toPrecedenceFreeEPL, validate, validateFilter, validateNumericChildAllowFilter, validatePositionals

Methods inherited from class com.espertech.esper.epl.expression.core.ExprNodeBase

accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprNode

accept, accept, acceptChildnodes, addChildNode, addChildNodes, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Constructor Detail

ExprPlugInAggFunctionFactoryNode

public ExprPlugInAggFunctionFactoryNode(boolean distinct,
                                        AggregationFunctionFactory aggregationFunctionFactory,
                                        java.lang.String functionName)

Ctor.

Parameters:

distinct - - flag indicating unique or non-unique value aggregation

aggregationFunctionFactory - - is the base class for plug-in aggregation functions

functionName - is the aggregation function name

Method Detail

validateAggregationChild

public AggregationMethodFactory validateAggregationChild(ExprValidationContext validationContext)
                                                  throws ExprValidationException

Description copied from class: ExprAggregateNodeBase

Gives the aggregation node a chance to validate the sub-expression types.

Specified by:

validateAggregationChild in class ExprAggregateNodeBase

Parameters:

validationContext - validation information

Returns:

aggregation function factory to use

Throws:

ExprValidationException - when expression validation failed

getAggregationFunctionName

public java.lang.String getAggregationFunctionName()

Description copied from class: ExprAggregateNodeBase

Returns the aggregation function name for representation in a generate expression string.

Specified by:

getAggregationFunctionName in class ExprAggregateNodeBase

Returns:

aggregation function name

equalsNodeAggregateMethodOnly

public final boolean equalsNodeAggregateMethodOnly(ExprAggregateNode node)

Description copied from class: ExprAggregateNodeBase

Return true if a expression aggregate node semantically equals the current node, or false if not.

For use by the equalsNode implementation which compares the distinct flag.

Specified by:

equalsNodeAggregateMethodOnly in class ExprAggregateNodeBase

Parameters:

node - to compare to

Returns:

true if semantically equal, or false if not equals